Combined muffler and heater



May 10 w. A. KYSOR COMBINED MUFFLER AND HEATER Original Filed May 24. 1924 2 Sheets-Sheet nazlzmajg s l ATTO RN EY May 10, 1927.

W. A. KYSOR COMBINED MUFFLER AND HEATER Original Filed May 24. 1924 INVENTOR Mzllerfl.lfasor Patented May 10, 1927.

UNITED STATES PATENT OFFICE.

WALTER A. KYSOR, OF ALLEGA N, MICHIGAN.

CQMBINED MUFFLER AND HEATER.

Original application filed May 24, 1924, Serial no. 715,307. Divided and A 24, 1925. Serial No. 4,543.

This invention relates to a combined inuflier and heater for use on motor driven vehicles, in which the impulses of the ex-- haust gas are silenced, and the heat of this gas is utilized for heating a current of air, which may be caused to circulate through the tonneau.

The general object of the invention is to provide a device of this character-which is comparatively simple and inexpensive in its construction, practical and eflicient in its Operation, and which, in its preferred form,

may be built as a single unit to be installed in place of the ordinary muifier now used.

The invention herein claimed includes certain features which have been divided from my co-pending application, Serial No. 715,307, filed 'May 23, 1924, and also-embodies certain. improvements over the con struction disclosed in said application. The structure of the invention and the cooperative relation between the passageway for theexhaust gases and the passageway for the current of air to be heated is such that not,

i only is the muffling action improved, but the heating-of the air current and its 'circula-.

tion through the tonneau is promoted.

The specific construction of the invention,

' as well as its objects and advantages, will be more fully explained in connection with the accompanying drawings, which illustrate the same in its preferred form,

In the drawings: Figure l-is a. side, elevation of the inven tion illustratin the same in connection with a portion of an automoble chassis.

Figure 2 is a vertical longitudinal section.

I through the mufiling and heating chambers.

- Figure 3 is. an enlarged cross section taken on the line 3-3 of Figure 2.

Figure 4 is'an enlarged cross section'taken on the line 5t-4 of Figure '2. a

Figure '5 is an enlarged cross section taken on the line 55 of Figure 2.

Figure 6 iszan enlarged cross section taken on the line 6-6 of Figure 2. v r

. Figure 7 is an enlarged detail sectional view of the rear portion of the invention.

Figure 8 is a similar detail view of the front. portion of the invention.

The invention, as herein disclosed,'includes an inner rearwardly tapered steel pipe 10 this application filed January of comparatively heavy gage, and having an enlarged front end formed by a tapered thimble 11, secured thereto in any suitable manner.

'Surrounding the tapered pipe 10 and spaced therefrom is 'a heating chamber 12 formed by inner and outer concentric cylin-' drical walls 13 and '14, which are maintained 15 and 16 interposed between theirrespective.,ends. One of these flanges,-as 15, is welded or otherwise secured to both of the wallsli and 14L, while the other flange l6 7 is welded to the outer wall 14:, and has a like, which also serve to secure .a reducercoupling member 18, adapted to receive the rear end of the exhaust pipe 19. It is, of course, obvious that couplings of difierent 7 sizes may be manufactured to fit the various sizes of exhaust pipes used on different motor vehicles.

The rearwardly tapered pipe 10=is provided with numerous holes 20, through which the exhaust gases may pass into contact with the inner wall 13 of the heating chamber, the holes in the front'portion of the pipe being'more numerous than those in the rear portion thereof. The rear end of which has only a restricted opening 22 there through, so that the greater portion of the exhaust gases will be forced outwardly through the holes 20 and come in contact with the wall 13. A number of annular baflle plates 23 are secured around therear portion of the pipev 10, and extend nearly to the wall 13. These baflie plates tend not only to further silence the motor impulses,

' in their relative'positions by annular flanges 4 the pipe 10 has a plug 21 -secured therein,

but also to retard the backward flow of the exhaust gas, and promote its heating action upon the wall 13 of the heating chamber.

which are welded thereto, and serve to sup port the rear end of the tapered pipe 10, and

eliminatevibration of the same.

The inner wall 13 is extended at its rear end beyond the end of the outer wall 14, and is'provided internally with a reinforcing ring 25, which forms a backingplate for screws 26 used for attaching a secondary mufiling chamber 22'. This chamber is substantially cylindrical, and within it are secured a plurality of batlie plates-28, each having a central orifice 29, alternating with smaller circular bafiie plates 30, which are supported with their edges spaced from the wall of the chamber, so that the gases entering the front end of the chamber pass alternately around the peripheries of the plates 30, and through the central openings 29 in the plates 28. The rear end of the chamber 27 is provided with an outlet nipple 31 to which may be attached a tail pipe 32 of the usual construction for carrying the exhaust gases to the extreme rear of the car.

Thewalls of the air chamber 12 are imperforate, except for an inlet nipple 33 opening tangentially into the bottom of the outer wall 14 near its forward end, and an outlet nipple 34 opening tangentially from the upper-portion of the wall 14 near its rear end. A flexible metal conduit, or a tubular conduit of ordinary pipe, may be clamped to the nipple 34 and arranged'to conduct a current of air from the chamber 12 into the tonneau. The other nipple 33 may be connected by a similar conduit to a funnelshaped intake placed directly back of the motor fan, so as to establish a continuous forced circulation of air through the heating chamber 12 and into the tonneau.

In the; preferred installation, as indicated in Figure l, the combined mufiier and heater is hung in the frame 35 of the chassis, in the usual position of'the conventional mufller. The air for heating the tonneau is conducted through a flexible conduit 36 which is located at one side of the motor,-an'd terminates at its forward end in a funnel-shaped mouth 37 located in rear of the fan 38. The rear end'of the conduit 36 is connected by an elbow to the inlet nipple 33'. By this construction, a forced draft is obtained through the heating chamber 12, which is also the cleanest air obtainable, since it comes from in front of the car, and it is also somewhat warmed by its flow through the radiator of the car. The tangential disposition of the nipple 33 causes the current of air to travel spirally between the walls 13 and 14, and to become thoroughly heated. A conduit 39 is connected to the outlet nipple 34, and leads to the interior of the tonneau. This conduit is preferably provided with a 11 valve housing 40, contalning a three-Way vention the distance between the larger end of the pipe and the inner 'wall-ot' the drum is approximately three-quarters of an inch while at the rear end the distance 1s approxi mately an inch and a half. the inner wall being of a .diameter of four and threefourths inches and the outer wall six and one-half inches, the length being thirty-two and one-half inches. This isthe dimension of the commercial structure as I have built the same for passenger cars.

With the parts thus arranged the heated gases or products of combustion are discharged through the perforations in the dischargepipe in jets impinging directly against the inner wall of the air conduit so that a very large ercentage of the heat may be absorbed or ta en up by the air passing through the conduit, theair drum providing a gas chamber through which the products of combustion are discharged to the auxiliar mufiler device described. The discharge from this chamber is restricted by the battle plates 23.

The restricted discharge openin 22 in the plug 21 at the rear end of the discharge 'pipe 1s of advantage in that carbon and other solids are effectively discharged throughthis -opening, thereby preventing their accumulation within the discharge pipe.

I preferably rovide lateral perforations close to this p ug which further facilitates the discharge of solids, at the same time compelling the bulk of the heater gases to be discharged through the side orifices in impingin relation, as stated, to the inner wall of t e air conduit.

As a very substantial percentage of the heat is taken up by the air, the pressure of the heated gases is very substantially reduced, thus adding to the muffling effect and reducing back pressure on the motor.

The device is very efficient both from the standpoint of its heating capacity and its mufliing capacity without serious back pressure. There is, in fact, much less back pressure than is present in the type of mutii-ers commonly used.

While I have shown and described specifically the various features of the invention in what is at present their preferred form, it is to be understood that these are subject to modification, as long as such modi- 130 ill! and outer tubular walls providing a central elongated gas chamber and a surrounding air chamber, said air chamber having air inlet and discharge openings at the ends thereof, said gas chamber having an annular gas discharge opening at its rear end, and a rear Wardly tapered discharge pipe for heated gases disposed centrally within said gas chamber and extending approximately from end to end thereof, the diameter of said pipe at its larger end being such that it lies close to the said inner wall, said pipe having a plurality of side discharge orifices disposed around it so that the heated gases are discharged therefrom in laterally directed jets and thence flow longitudinally through. said charge 0 enings at the ends thereof, said gas cham 'er havin a gas discharge opening at its rear en and a discharge pi e for heated gases disposed longitudinal y within said gas chamber, the diameter of said pipe being such that it lies relatively close to the said inner wall, said. pipe having a plurality of side discharge orifices disposed around it so that the heated gases are discharged therefrom in laterally directed jets against the said inner wall and thence flow rearwardly in said gas chamber around said pipe to said gas discharge opening at the rear end thereof. 0

In testimony, that I claim the foregoing as my own, I have hereto aflixed my signature.

WALTER A. KYSOR. 

